CN113632289B - Battery system and sampling method thereof, electronic device and readable storage medium - Google Patents

Abstract

The present application provides a battery system and a sampling method thereof, an electronic device, and a readable storage medium. The sampling method includes: acquiring a measured voltage of a first single battery, wherein the measured voltage is directly applied to the first single battery The positive and negative poles of the voltage sampling to obtain a first sampled voltage; based on the first sampled voltage and the measured voltage to determine the equivalent resistance of the sampling chip; turn on the equalization unit corresponding to at least two single cells at every interval, and measure the first sampled voltage in an equalized state The single battery performs voltage sampling to obtain a second sampling voltage; and based on the second sampling voltage and the equivalent resistance of the sampling chip, the current actual voltage of the first single battery is determined. The present application can make the collected single battery voltage not affected by the equalization circuit, and can improve the sampling frequency of the battery voltage.

Description

Battery system and sampling method thereof, electronic device and readable storage medium

technical field

The present application relates to the field of battery technology, and in particular, to a battery system, a sampling method for a battery system, an electronic device, and a readable storage medium.

Background technique

For a battery, when discharging, the amount of power that can be released depends on the current minimum cell voltage; when charging, the amount of power that can be charged depends on the maximum cell voltage. In the early stage of packaging, the cell consistency is excellent. However, with the accumulation of use time, due to factors such as cell aging, the consistency of the monomer is getting worse and worse. Therefore, maintaining the consistency of the single battery has a very large effect on its charge and discharge performance. At present, the main methods of maintaining consistency include active equilibrium, passive equilibrium, and hybrid equilibrium. However, the drawback is that when a single cell is performing the equalization action, due to the interference of the equalization circuit, sampling errors will occur in the adjacent two cell strings and the current cell. In order to ensure the accuracy of the sampling data , the equalization can only be turned off during voltage acquisition, or the voltage sampling can be turned off during equalization, resulting in a reduction in the sampling frequency.

SUMMARY OF THE INVENTION

In view of the above, it is necessary to provide a battery system, a sampling method for the battery system, an electronic device, and a readable storage medium, so that the collected voltage of a single cell is not affected by an equalization loop, thereby increasing the sampling frequency of the battery voltage.

Embodiments of the present application provide a battery system, the battery system includes a plurality of single cells, a plurality of sampling units, a plurality of equalization units, a sampling chip and a processing module, the plurality of the single cells form an electrical connection path, and the plurality of Each of the sampling units and the sampling chip forms a plurality of sampling loops, each of the single cells is electrically connected to one of the sampling loops and one of the equalization units, and the first of the plurality of single cells is electrically connected to one of the sampling loops and one of the equalization units. The single battery is correspondingly electrically connected to a first sampling unit of the plurality of sampling units and a first equalization unit of the plurality of equalization units, and the first sampling unit and the sampling chip form a first sampling loop;

The processing module is used to obtain the measured voltage of the first single cell, and the sampling chip is used to measure the voltage before the first equalization unit is triggered and the first sampling loop is triggered. The first single cell performs voltage sampling to obtain a first sampling voltage, and the processing module is further configured to determine the sampling according to the first sampling voltage, the measurement voltage and the equivalent resistance of the first sampling unit The equivalent resistance of the chip, wherein the measurement voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single cell;

The sampling chip is further configured to sample the voltage of the first single cell to obtain a second sampling voltage when the first equalizing unit is triggered and the first single cell enters the balanced state, and the processing module It is also used to determine the value of the first unit cell according to the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, and the equivalent resistance of the first equalizing unit. Current actual voltage.

According to some embodiments of the present application, the equivalent resistance of the first sampling unit includes the input equivalent resistance of the positive terminal branch and the current-limiting equivalent resistance, and the input equivalent resistance of the negative terminal branch and the current-limiting equivalent resistance, the equivalent resistance of the sampling chip is determined by the following formula:

R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref −U _d1 );

Wherein, R _d is the equivalent resistance of the sampling chip, U _ref is the measured voltage of the first single cell, U _d1 is the first sampling voltage, R ₁ is the input equivalent resistance, and R ₂ is the current limiting equivalent resistance.

According to some embodiments of the present application, the current actual voltage of the first single cell is determined by the following formula:

U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ];

Wherein, U ₁ is the current actual voltage of the first single battery, U _d2 is the second sampling voltage, and R _b is the equivalent resistance of the first equalizing unit.

According to some embodiments of the present application, the sampling chip further performs voltage sampling on a previous single cell adjacent to the first single cell to obtain a third sampling voltage, and the processing module is further configured to obtain a third sampling voltage according to the first single cell voltage. Three sampling voltages, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalization unit, and the current actual voltage of the first single battery are determined and The current actual voltage of the previous single cell adjacent to the first single cell.

According to some embodiments of the present application, the current actual voltage of the previous single cell adjacent to the first single cell is determined by the following formula:

U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d ;

Wherein, U ₀ is the current actual voltage of the last single cell adjacent to the first single cell, and U _d3 is the third sampling voltage.

According to some embodiments of the present application, the sampling chip further performs voltage sampling on the next single cell adjacent to the first single cell to obtain a fourth sampling voltage, and the processing module is further configured to obtain a fourth sampling voltage according to the first single cell voltage. Four sampling voltages, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalization unit, and the current actual voltage of the first single cell are determined and The current actual voltage of the next cell adjacent to the first cell.

According to some embodiments of the present application, the current actual voltage of the next single cell adjacent to the first single cell is determined by the following formula:

U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d ;

Wherein, U ₂ is the current actual voltage of the next single cell adjacent to the first single cell, and U _d4 is the fourth sampling voltage.

Embodiments of the present application further provide a sampling method for a battery system, where the battery system includes a plurality of single cells, a plurality of sampling units, a plurality of equalization units, and a sampling chip, and the plurality of the single cells form an electrical connection path, A plurality of the sampling units and the sampling chip form a plurality of sampling loops, each of the single cells is electrically connected to one of the sampling loops and one of the equalization units, and the first one of the plurality of single cells is electrically connected to one of the sampling loops and one of the equalization units. A single battery is correspondingly electrically connected to the first sampling unit of the plurality of sampling units and the first equalization unit of the plurality of equalization units, and the first sampling unit and the sampling chip form a first sampling loop, The method includes:

acquiring the measured voltage of the first single battery, wherein the measured voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single battery;

When the first equalization unit is triggered and the first sampling loop is triggered, sampling the voltage of the first single cell to obtain a first sampling voltage;

determining the equivalent resistance of the sampling chip based on the first sampling voltage and the measurement voltage;

Turning on the equalization unit corresponding to at least two single cells at every interval, and sampling the voltage of the first single cell in an equalized state to obtain a second sampling voltage; and

The current actual voltage of the first unit cell is determined based on the second sampling voltage and the equivalent resistance of the sampling chip.

According to some embodiments of the present application, the step of determining the equivalent resistance of the sampling chip based on the first sampling voltage and the measurement voltage includes:

The equivalent resistance of the sampling chip is determined based on the first sampling voltage, the measurement voltage and the equivalent resistance of the first sampling unit.

According to some embodiments of the present application, the equivalent resistance of the first sampling unit includes the input equivalent resistance of the positive terminal branch and the current-limiting equivalent resistance, and the input equivalent resistance of the negative terminal branch and the current-limiting equivalent resistance, the step of determining the equivalent resistance of the sampling chip includes:

Determine the equivalent resistance of the sampling chip by using a first preset formula;

The first preset formula is: R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref -U _d1 ), R _d is the equivalent resistance of the sampling chip, and U _ref is the The measured voltage of the first single cell, U _d1 is the first sampling voltage, R ₁ is the input equivalent resistance, and R ₂ is the current limiting equivalent resistance.

According to some embodiments of the present application, the step of determining the current actual voltage of the first single cell based on the second sampling voltage and the equivalent resistance of the sampling chip includes:

The current actual voltage of the first single battery is determined based on the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, and the equivalent resistance of the first equalizing unit .

According to some embodiments of the present application, the step of determining the current actual voltage of the first single cell includes:

Determine the current actual voltage of the first single battery by using a second preset formula;

Wherein, the second preset formula is:

U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ], U ₁ is the current actual voltage of the first single cell, U _d2 is the second sampling voltage, and R _b is the equivalent resistance of the first equalizing unit.

According to some embodiments of the present application, the method further includes:

sampling the voltage of the last single cell adjacent to the first single cell to obtain a third sampling voltage; and

Based on the third sampling voltage, the equivalent resistance of the sampling chip, and the current actual voltage of the first single battery, the current actual voltage of the previous single battery adjacent to the first single battery is determined.

According to some embodiments of the present application, the step of determining the current actual voltage of the previous single cell adjacent to the first single cell includes:

Using a third preset formula to determine the current actual voltage of the previous single cell adjacent to the first single cell;

Wherein, the third preset formula is:

U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d ,

U ₀ is the current actual voltage of the last single cell adjacent to the first single cell, and U _d3 is the third sampled voltage.

According to some embodiments of the present application, the method further includes:

sampling the voltage of the next single cell adjacent to the first single cell to obtain a fourth sampled voltage; and

The current actual voltage of the next single battery adjacent to the first single battery is determined based on the fourth sampling voltage, the equivalent resistance of the sampling chip, and the current actual voltage of the first single battery.

According to some embodiments of the present application, the step of determining the current actual voltage of the next cell adjacent to the first cell includes:

Using a fourth preset formula to determine the current actual voltage of the next single cell adjacent to the first single cell;

Wherein, the fourth preset formula is:

U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d ,

U ₂ is the current actual voltage of the next single cell adjacent to the first single cell, and U _d4 is the fourth sampled voltage.

Embodiments of the present application further provide an electronic device, the electronic device comprising:

A battery system, including a plurality of sampling units, a plurality of equalization units, a plurality of single cells and a sampling chip; and

The processor is configured to execute the steps of the above-mentioned sampling method of the battery system.

Embodiments of the present application further provide a readable storage medium, where computer instructions are stored in the readable storage medium, and when the computer instructions are executed on an electronic device, the electronic device is made to execute the above-mentioned method of sampling a battery system. step.

The battery system, the sampling method for the battery system, the electronic device, and the readable storage medium provided by the embodiments of the present application compensate the voltage of the single cell collected in the equalization stage, so that the collected voltage of the single cell is not affected by the equalization circuit. This can increase the sampling frequency of the battery voltage.

Description of drawings

FIG. 1 is a schematic structural diagram of a battery system according to an embodiment of the present application.

FIG. 2 is an equivalent circuit diagram of a battery system according to an embodiment of the present application.

FIG. 3 is an equivalent circuit diagram of a sampling circuit of a single cell according to an embodiment of the present application when equalization is not turned on.

FIG. 4 is an equivalent circuit diagram of a sampling circuit when a target single cell enters an equilibrium state according to an embodiment of the present application.

FIG. 5 is an equivalent circuit diagram of a sampling circuit of a previous single cell adjacent to the target single cell when the target single cell enters an equilibrium state according to an embodiment of the present application.

6 is an equivalent circuit diagram of a sampling circuit of a next single cell adjacent to the target single cell when the target single cell enters an equilibrium state according to an embodiment of the present application.

FIG. 7 is a flowchart of a method for adopting a battery system according to an embodiment of the present application.

FIG. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of main component symbols

battery system 100

Electronics 200

Processor 300

Computer Programs 400

Memory 500

Sampling unit 10a, 10b, 10c

Equalization units 20a, 20b, 20c

Single cells 30a, 30b, 30c

Sampling Chip 40

processing module 50

The following specific embodiments will further describe the present application in detail with reference to the above drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments.

Please refer to FIG. 1 , which is a schematic structural diagram of a battery system 100 according to an embodiment of the present application.

The battery system 100 in an embodiment of the present application includes a plurality of sampling units 10a-10c (FIG. 1 only takes three sampling units 10a, 10b, 10c as an example for description, there may be more than three or less than three), a plurality of sampling units 10a, 10b and 10c. balance units 20a-20c (only three balance units 20a, 20b, 20c are taken as an example for illustration in FIG. 1, there may be more or less than three), a plurality of single cells 30a-30c (FIG. 1 only shows Three single cells 30a, 30b, 30c are taken as an example for description, and there may be more or less than three), the sampling chip 40 and the processing module 50. Each sampling unit 10a-10c includes two sampling branches, and a plurality of single cells 30a-30c form an electrical connection path. For example, a plurality of single cells 30 are connected in series, that is, when the positive electrode of the single cell 30b is connected to the single cell The negative electrode of the battery 30a is electrically connected, and the negative electrode of the unit cell 30b is electrically connected to the positive electrode of the unit battery 30c. The plurality of sampling units 10a-10c and the sampling chip 40 can form a plurality of sampling loops, so as to realize sampling of the plurality of single cells 30a-30c. Each single cell 30a-30c can be electrically connected to one sampling loop and one equalizing unit 20a-20c, for example, the single cell 30a corresponds to the sampling unit 10a and the equalizing unit 20a, and the single cell 30b corresponds to the sampling unit 10b and the equalizing unit Corresponding to 20b, the single cell 30c corresponds to the sampling unit 10c and the equalizing unit 20c. Each of the balancing units 20a-20c can make the corresponding single cells 30a-30c electrically connected to enter a passive balancing state. In other embodiments of the present application, each balancing unit 20 may also make the single cells 30a to 30c electrically connected to it enter an active balancing state, or enter a hybrid balancing state.

In an embodiment of the present application, how many sampling units the sampling chip 40 can be combined with may be determined according to the number of sampling channels of the sampling chip 40 . For example, if the number of sampling channels of the sampling chip 40 is 8, the sampling chip 40 can be combined with 8 sampling units to obtain 8 sampling loops, and then the voltage of 8 single cells can be sampled. If the battery system 100 includes 16 single cells If a bulk battery is used, at least two sampling chips 40 are required. The sampling chip 40 can cooperate with 8 sampling units through the working mode of time-division sampling to realize voltage sampling of 8 single cells.

In an embodiment of the present application, the sampling units 10a - 10c and the equalization units 20a - 20c can be designed using existing circuit solutions, which are not limited herein. The sampling units 10a-10c may have the same circuit structure, and the equalizing units 20a-20c may have the same circuit structure. The unit cells 30a to 30c may be lithium ion batteries, lithium polymer batteries, or the like. The sampling chip 40 may be an analog front end (AFE) chip. The processing module 50 may be a device with computing processing capabilities, such as a system (System On Chip) chip, a central processing unit (Central Processing Unit, CPU), an ARM (Advanced RISCMachine) processor, a Field Programmable Gate Array (Field Programmable Gate Array) , FPGA), special-purpose processors, etc.

In an embodiment of the present application, the unit cell 30a is taken as an example for illustration. In the stage where the actual voltage of the single battery 30a can be directly measured, for example, before being packaged into a battery pack, an external voltage measuring device (such as a voltmeter, a voltage measuring instrument, etc.) or a measuring circuit can be used directly to measure the Measure the actual voltage of the single cell 30a.

For example, before packaging into a battery pack, an external voltage measuring device is used to measure the actual voltage of the single cell 30a, and the measured voltage measured by the external voltage measuring device is the actual voltage of the single cell 30a. When the two probes of the voltmeter or voltage measuring instrument are respectively connected to the positive and negative electrodes of the single cell 30a, the measured voltage of the single cell 30a (ie, the actual voltage of the single cell 30a) can be obtained. After the plurality of single cells 30a-30c are packaged into a battery pack, since the probe can no longer be directly connected to the positive and negative electrodes of the single cells, it is no longer possible to use an external voltage measuring device to directly measure each single cell 30a. ~30c voltage.

In an embodiment of the present application, the processing module 50 can obtain the measured voltage of the single cell 30a. For example, after using an external voltage measuring device to measure the measured voltage of the single battery 30a, the measured voltage can be stored in a memory, and the processing module 50 can communicate with the memory to obtain the voltage of the single battery 30a. measure voltage.

When the measured voltage of the single battery 30a is obtained, the voltage of the single battery 30a can be collected through the sampling circuit corresponding to the single battery 30a and compared with the measured voltage of the single battery 30a, and then the voltage of the sampling chip 40 can be determined. equivalent resistance. Specifically, before the balancing unit 20a corresponding to the single cell 30a is triggered, and the sampling circuit corresponding to the single cell 30a is triggered, and a measured voltage is obtained by measuring the voltage of the single cell 30a, sampling The chip 40 can sample the voltage of the single cell 30a to obtain a first sampling voltage, and the processing module 50 can determine the sampling chip 40 according to the first sampling voltage, the measured voltage of the single cell 30a and the equivalent resistance of the sampling unit 10a equivalent resistance. The sampling loop being triggered may mean that the sampling channel of the sampling chip 40 corresponding to the sampling loop is triggered (the sampling channel enters the sampling working mode).

In an embodiment of the present application, when the balancing circuit of the single cell 30a is turned on, the voltages sampled by the single cell 30a and the single cell 30b may deviate from the actual cell voltage. When the balancing circuit of the single cell 30b is turned on, the voltages sampled by the single cell 30a, the single cell 30b and the single cell 30c will be deviated from the actual cell voltage. When the balancing circuit of the single cell 30c is turned on, the voltages sampled by the single cell 30b and the single cell 30c may deviate from the actual cell voltage.

The processing module 50 can obtain the current actual voltages of the single cells 30a-30c in the following manner, so as to avoid that the collected voltages of the single cells 30a-30c are not affected by the equalization circuit. Specifically, when one of the multiple equalization modules 20a-20c is triggered, for example, the equalization module 20b is triggered. The equalization module 20b enters the equalization state corresponding to the electrically connected single cell 30b, and the sampling chip 40 further samples the voltage of the single cell 30b to obtain a second sampling voltage. The processing module 50 can obtain the second sampling voltage according to the second sampling voltage and the equivalent The resistance, the equivalent resistance of the sampling chip 40, and the equivalent resistance of the equalization unit 20b determine the current actual voltage of the single cell 30b.

It can be understood that if the equalization module 20c is triggered. The equalization module 20c enters the equalization state corresponding to the electrically connected single cell 30c, and the sampling chip 40 also samples the voltage of the single cell 30c to obtain a sampling voltage. The equivalent resistance of the chip 40 and the equivalent resistance of the balancing unit 20c determine the current actual voltage of the single cell 30c.

As shown in FIG. 2 , it is a schematic diagram of an equivalent circuit of the battery system 100 according to an embodiment of the present application.

In an embodiment of the present application, taking three single cells 30a, 30b, 30c, each sampling unit 10a-10c having the same circuit structure, and each equalizing unit 20a-20c having the same circuit structure as an example Give an example. The BAT1 terminal is the positive pole of the single battery 30a, the BAT2 terminal is the negative pole of the single battery 30a and the positive pole of the single battery 30b, the BAT3 terminal is the negative pole of the single battery 30b and the positive pole of the single battery 30c, and the BAT4 terminal is the single battery 30c. The negative electrode of the bulk battery 30c. The sampling branches of the BAT1 terminal, the BAT2 terminal, the BAT3 terminal and the BAT4 terminal all include an input equivalent resistance R ₁ and a current-limiting equivalent resistance R ₂ , that is, the sampling unit 10a is equivalent to the input equivalent resistance R ₁ of the BAT1 terminal and the current-limiting equivalent resistance R 2 . The equivalent resistance R ₂ and the input equivalent resistance R ₁ of the BAT2 terminal and the current-limiting equivalent resistance R ₂ , the sampling unit 10b is equivalent to the input equivalent resistance R ₁ of the BAT2 terminal, the current-limiting equivalent resistance R ₂ and the input of the BAT3 terminal Equivalent resistance R ₁ , current-limiting equivalent resistance R ₂ , the sampling unit 10c is equivalent to the input equivalent resistance R ₁ of the BAT3 terminal, the current-limiting equivalent resistance R ₂ , the input equivalent resistance R ₁ of the BAT4 terminal, the current-limiting terminal, etc. Effective resistance R ₂ .

The resistance R _d is the equivalent resistance of the sampling chip 40 , that is, the equivalent resistance of the internal sampling circuit of the sampling chip 40 and the analog-to-digital converter, and the sampling point Cell ₁ is the sampling point where the sampling chip 40 samples the voltage of the BAT1 terminal. The sampling point Cell ₂ is the sampling point where the sampling chip 40 samples the voltage of the BAT2 terminal, the sampling point Cell ₃ is the sampling point where the sampling chip 40 samples the voltage of the BAT3 terminal, and the sampling point Cell ₄ is the sampling point where the sampling chip 40 samples the voltage of the BAT4 terminal point.

The input equivalent resistance R ₁ of the BAT1 terminal, the current-limiting equivalent resistance R ₂ , the equivalent resistance R _d of the sampling chip 40 , and the input equivalent resistance R ₁ and the current-limiting equivalent resistance R ₂ of the BAT2 terminal constitute the first sampling loop to realize The voltage of the single battery 30a is sampled, the input equivalent resistance R ₁ of the BAT2 terminal, the current-limiting equivalent resistance R ₂ , the equivalent resistance R _d of the sampling chip 40 , and the input equivalent resistance R ₁ and the current-limiting equivalent resistance of the BAT3 terminal. R ₂ constitutes a second sampling loop, which realizes the voltage sampling of the single battery 30b. The input equivalent resistance R ₁ of the BAT3 terminal, the current limiting equivalent resistance R ₂ , the equivalent resistance R _d of the sampling chip 40 and the input equivalent of the BAT4 terminal are equivalent The resistor R ₁ and the current-limiting equivalent resistor R ₂ form a third sampling loop, which implements voltage sampling of the single battery 30c. Each equalization unit 20a-20c is equivalent to a resistor _Rb and a controllable switch S1. When the controllable switch S1 is closed, it means that the current balancing unit is turned on, and the single cells electrically connected to the current balancing unit enter a passive balancing state.

In other embodiments of the present application, each of the sampling units 10a to 10c may also have different circuit structures, and each of the equalization units 20a to 20c may also have different circuit structures.

As shown in FIG. 3, taking the single cell 30a as an example, in the stage where the actual voltage of the single cell 30a can be directly measured, the voltage of the single cell 30a can be collected and measured with the voltage of the single cell 30a. The comparison is made to determine the equivalent resistance R _d of the sampling chip 40 . For example, the equivalent resistance R _d of the sampling chip 40 may be determined in this manner before the battery system 100 is shipped (not packaged into a battery pack). In FIG. 3 , the current of the sampling loop is I ₁ , the measured voltage of the single cell 30a is U _ref , the sampling chip 40 samples the sampling points Cell ₁ and Cell ₂ to obtain the first sampling voltage U _d1 , and then the first sampling voltage is U d1 . The following two formulas can be constructed:

U _ref =I ₁ *(2R ₁ +2R ₂ +R _d )--i;

U _d1 =I ₁ *R _d --ii;

From the above formulas i and ii, the equivalent resistance R _d of the sampling chip 40 can be solved as shown in formula iii:

R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref −U _d1 )--iii;

Since the parameters U _d1 , R ₁ , R ₂ , and U _ref in the above formula iii all have known parameter values, the resistance value of the equivalent resistance R _d of the sampling chip 40 can be determined according to the formula iii.

As shown in FIG. 4 , taking the single cell 30b as an example, the equalization unit 20b is turned on, and the single cell 30b enters a passive equalization state. The equivalent resistance of , the equivalent resistance of the sampling chip 40 and the equivalent resistance of the equalization unit 20b determine the current actual voltage of the single battery 30b. In FIG. 4 , the current flowing through the input equivalent resistance R ₁ of the BAT2 terminal is I ₁ , the current flowing through the current limiting equivalent resistance R ₂ of the BAT2 terminal is I ₃ , and the current flowing through the equivalent resistance R _b of the balancing unit 20b The current is I ₂ , the current actual voltage of the single cell 30b is U ₁ , and the sampling chip 40 samples the sampling points Cell ₂ and Cell ₃ to obtain a second sampling voltage U _d2 , based on the mesh current analysis method, the following four formula:

I ₁ =I ₂ +I ₃ --i;

I ₃ =U _d2 /R _d --ii;

-I ₂ *R _b =I ₃ * ₍ 2R ₂ +R _d )--iii;

-U ₁ =I ₁ *R ₁ +I ₂ *R _b +(I ₃ +I ₂ )*R ₁ --iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30b is U ₁ as shown in the formula v:

U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ]--v;

Since the parameters U _d2 , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₁ of the single battery 30b can be determined according to the formula v, that is, after compensation The sampled voltage of the subsequent single cell 30b.

As shown in FIG. 5 , taking the equalization unit 20b turned on and the single cell 30b entering the passive equalization state as an example, the third cell 30a of the previous single cell 30a adjacent to the single cell 30b can be collected by the sampling chip 40 . The sampling voltage, the equivalent resistance of the sampling unit 10a, the equivalent resistance of the sampling chip 40, the equivalent resistance of the equalization unit 20b, and the current actual voltage of the single cell 30b determine the current actual voltage of the single cell 30a. In FIG. 5 , the current flowing through the input equivalent resistance R ₁ of the BAT2 terminal is I ₁ , the current flowing through the equivalent resistance R _b of the equalizing unit 20b is I ₂ , and the current flowing through the input equivalent resistance R ₁ of the BAT1 terminal is I 2 . The current is I ₃ , the current actual voltage of the single cell 30a is U ₀ , the current actual voltage of the single cell 30b is U ₁ , the sampling chip 40 samples the sampling points Cell ₁ and Cell ₂ to obtain a third sampling voltage U _d3 , based on the mesh current analysis method, the following four formulas can be constructed:

I ₁ =I ₂ -I ₃ -i;

I ₃ =U _d3 /R _d --ii;

-U ₀ =I ₃ *(R ₁ +2R ₂ +R _d )-I ₁ *R ₁ --iii;

-U ₁ =I ₁ *R ₁ +I ₂ *(R _b +R ₁ )--iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30a is U ₀ as shown in the formula v:

U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d --v;

Since the parameters U _d3 , U ₁ , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₀ of the single cell 30a can be determined according to the formula v, that is, is the sampled voltage of the single battery 30a after compensation.

As shown in FIG. 6 , also taking the equalization unit 20b turned on and the single cell 30b entering the passive equalization state as an example, the fourth cell 30c of the next single cell 30c adjacent to the single cell 30b can be collected by the sampling chip 40 . The sampling voltage, the equivalent resistance of the sampling unit 10c, the equivalent resistance of the sampling chip 40, the equivalent resistance of the equalization unit 20b, and the current actual voltage of the single cell 30b determine the current actual voltage of the single cell 30c. In FIG. 6 , the current flowing through the equivalent resistance R _b of the equalizing unit 20 b is I ₁ , the current flowing through the input equivalent resistance R ₁ of the BAT3 terminal is I ₂ , and the current limiting equivalent resistance R ₂ flowing through the BAT3 terminal The current of the single cell 30c is I ₃ , the current actual voltage of the single cell 30c is U ₂ , the current actual voltage of the single cell 30b is U ₁ , the sampling chip 40 samples the sampling points Cell ₃ and Cell ₄ to obtain a fourth sampling voltage of U 2 . _d4 , the following four formulas can be constructed based on the mesh current analysis method:

I ₁ =I ₂ +I ₃ --i;

I ₃ =U _d4 /R _d --ii;

-U ₁ =I ₁ *(R _b +R ₁ )+I ₂ *R ₁ --iii;

-U ₂ =I ₂ *R ₁ +I ₃ *(R ₁ +2R ₂ +R _d )--iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30c is U ₂ as shown in the formula v:

U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d --v;

Since the parameters U _d4 , U ₁ , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₂ of the single battery 30c can be determined according to the formula v, that is, is the sampled voltage of the single battery 30c after compensation.

The technical solution of the present application realizes that during the balancing process of the battery system 100, the voltage of a single cell can still be sampled to obtain an accurate sampling voltage, so that the collected voltage of the single cell is not affected by the balancing circuit, and overcomes the problem of the battery in the prior art. In the equalization stage, the battery voltage sampling needs to be stopped, which leads to the defect that the sampling frequency is reduced.

Please refer to FIG. 7 , which is a flowchart of a sampling method of a battery system according to an embodiment of the present application. The sampling method of the battery system may include the following steps:

Step S71: Obtain the measured voltage of a single battery.

In an embodiment of the present application, the measurement voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of a single battery. For example, an external voltage measuring device can be used to directly measure the positive electrode and the negative electrode of a single battery. Measure to get its measured voltage.

Step S72: Before the balancing unit corresponding to the one single cell is triggered, perform voltage sampling on the one single cell to obtain a first sampled voltage.

In an embodiment of the present application, as shown in FIG. 3 , taking the single cell as the single cell 30 a as an example, before the equalization unit 20 a corresponding to the single cell 30 a is triggered, the sampling circuit corresponding to the single cell 30 a is In the case of being triggered, the voltage of the single cell 30a can be collected by the sampling chip 40, that is, the first sampling voltage can be obtained by sampling the sampling points Cell ₁ and Cell ₂ with the sampling chip 40 . It can be understood that in other embodiments of the present application, when the actual voltage of the single cell 30b can be directly measured, the sampling chip 40 can be used to collect the voltage of the single cell 30b, that is, the sampling chip 40 can be used to measure the sampling point Cell ₂ , Cell ₃ performs sampling to obtain the first sampling voltage.

Step S73: Determine the equivalent resistance of the sampling chip 40 based on the first sampling voltage and the measured voltage of the single cell 30a.

In an embodiment of the present application, as shown in FIG. 3 , the current of the sampling loop is I ₁ , the measured voltage of the single cell 30a is U _ref , and the sampling chip 40 samples the sampling points Cell ₁ and Cell ₂ to obtain the first A sampling voltage is U _d1 , and then the following two formulas can be constructed:

U _ref =I ₁ *(2R ₁ +2R ₂ +R _d )--i;

U _d1 =I ₁ *R _d --ii;

From the above formulas i and ii, the equivalent resistance R _d of the sampling chip 40 can be solved as shown in formula iii:

R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref −U _d1 )--iii;

Since the parameters U _d1 , R ₁ , R ₂ , and U _ref in the above formula iii all have known parameter values, the resistance value of the equivalent resistance R _d of the sampling chip 40 can be determined according to the formula iii.

It can be understood that if the actual voltage of the single battery 30b can be directly measured, the sampling chip 40 can also sample the sampling points Cell ₂ and Cell ₃ to obtain a sampling voltage, and use the above calculation principle based on the sampling points Cell ₂ , Cell 2 , Cell 3 . The sampling voltage between the cells ₃ and the measuring voltage U _ref of the single cell 30 b determine the equivalent resistance R _d of the sampling chip 40 . If the actual voltage of the single cell 30c can be directly measured, the sampling chip 40 can also sample the sampling points Cell ₃ and Cell ₄ to obtain a sampling voltage, and use the above calculation principle based on the difference between the sampling points Cell ₃ and Cell ₄ . The sampling voltage between and the measurement voltage U _ref of the single cell 30c determine the equivalent resistance R _d of the sampling chip 40 .

Step S74 : Turn on the equalization unit corresponding to at least two single cells at every interval, and perform voltage sampling on one single cell in an equalized state to obtain a second sampling voltage.

In an embodiment of the present application, due to the equalization circuit of a single cell, the voltage of the previous single cell adjacent to the single cell may deviate from the actual battery voltage, and the next cell adjacent to the single cell may The battery deviates from the actual battery voltage. The present application calculates the actual voltage of a single cell, calculates the actual voltage of the previous single cell adjacent to the single cell, and calculates the actual voltage of the single cell adjacent to the single cell when the single cell enters the passive equilibrium state. The actual voltage of the next single cell can then be turned on by turning on the equalization unit corresponding to at least two single cells at every interval, that is, the plurality of single cells 30a to 30c are turned on at least two single cells at every interval. balanced.

Taking the single battery as the single battery 30b as an example, the balancing unit 20b is turned on, and the single battery 30b enters a passive balance state. The sampling chip 40 can be used to sample the voltage of the single cell 30b in the balanced state to obtain the second sampling voltage, that is, when the single cell 30b enters the passive balanced state, the sampling chip 40 can be used to sample the sampling points Cell ₂ and Cell ₃ Two sampling voltages are obtained. Step S75 : Determine the current actual voltage of the single cell 30 b based on the second sampling voltage and the equivalent resistance of the sampling chip 40 .

In an embodiment of the present application, when the equivalent resistance of the sampling chip 40 and the second sampling voltage of the single cell 30b in a balanced state are obtained, the second sampling voltage and the The effective resistance determines the current actual voltage of the single cell 30b. As shown in FIG. 4 , the current flowing through the input equivalent resistance R ₁ of the BAT2 terminal is I ₁ , the current flowing through the current-limiting equivalent resistance R ₂ of the BAT2 terminal is I ₃ , and the equivalent resistance R flowing through the equalization unit 20b The current of _b is I ₂ , the current actual voltage of the single cell 30b is U ₁ , and the sampling chip 40 samples the sampling points Cell ₂ and Cell ₃ to obtain the second sampling voltage as U _d2 . Based on the mesh current analysis method, it can be Build the following four formulas:

I ₁ =I ₂ +I ₃ --i;

I ₃ =U _d2 /R _d --ii;

-I ₂ *R _b =I ₃ * ₍ 2R ₂ +R _d )--iii;

-U ₁ =I ₁ *R ₁ +I ₂ *R _b +(I ₃ +I ₂ )*R ₁ --iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30b is U ₁ as shown in the formula v:

U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ]--v;

Since the parameters U _d2 , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₁ of the single battery 30b can be determined according to the formula v, that is, after compensation The sampled voltage of the subsequent single cell 30b.

Step S76: Perform voltage sampling on the previous single cell 30a adjacent to the one single cell 30b to obtain a third sampled voltage.

In an embodiment of the present application, when the single cell 30b enters the passive equilibrium state, the sampling chip 40 can also be used to sample the voltage of the previous single cell 30a adjacent to the single cell 30b to obtain the third sampling voltage, That is, when the single cell 30b enters the passive equalization state, the sampling chip 40 can be used to sample the sampling points Cell ₁ and Cell ₂ to obtain three sampling voltages.

Step S77: Determine the previous single cell 30a adjacent to the one single cell 30b based on the third sampling voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the one single cell 30b the current actual voltage.

In an embodiment of the present application, when the equivalent resistance of the sampling chip 40, the current actual voltage of the single cell 30b in the equilibrium state, and the third sampling voltage of the single cell 30a are obtained, the third sampling The voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the single cell 30b determine the current actual voltage of the previous single cell 30a adjacent to the single cell 30b. As shown in FIG. 5 , the current flowing through the input equivalent resistance R ₁ of the BAT2 terminal is I ₁ , the current flowing through the equivalent resistance R _b of the equalizing unit 20b is I ₂ , and the input equivalent resistance R ₁ flowing through the BAT1 terminal is The current is I ₃ , the current actual voltage of the single cell 30a is U ₀ , the current actual voltage of the single cell 30b is U ₁ , the sampling chip 40 samples the sampling points Cell ₁ and Cell ₂ to obtain a third sampling voltage U _d3 , the following four formulas can be constructed based on the mesh current analysis method:

I ₁ =I ₂ -I ₃ -i;

I ₃ =U _d3 /R _d --ii;

-U ₀ =I ₃ *(R ₁ +2R ₂ +R _d )-I ₁ *R ₁ --iii;

-U ₁ =I ₁ *R ₁ +I ₂ *(R _b +R ₁ )--iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30a is U ₀ as shown in the formula v:

U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d --v;

Since the parameters U _d3 , U ₁ , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₀ of the single cell 30a can be determined according to the formula v, that is, is the sampled voltage of the single battery 30a after compensation.

Step S78: Perform voltage sampling on the next single cell 30c adjacent to the one single cell 30b to obtain a fourth sampled voltage.

In an embodiment of the present application, when the single cell 30b enters the passive equilibrium state, the sampling chip 40 can also be used to sample the voltage of the next single cell 30c adjacent to the single cell 30b to obtain the fourth sampling voltage, That is, when the single cell 30b enters the passive equalization state, the sampling chip 40 can be used to sample the sampling points Cell ₃ and Cell ₄ to obtain four sampling voltages.

Step S79: Determine the next single cell 30c adjacent to the one single cell 30b based on the fourth sampling voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the one single cell 30b the current actual voltage.

In an embodiment of the present application, when the equivalent resistance of the sampling chip 40, the current actual voltage of the single cell 30b in the equilibrium state, and the fourth sampling voltage of the single cell 30c are obtained, the fourth sampling The voltage, the equivalent resistance of the sampling chip 40 and the current actual voltage of the single cell 30b determine the current actual voltage of the next single cell 30c adjacent to the single cell 30b. As shown in FIG. 6 , let the current flowing through the equivalent resistance R _b of the equalizing unit 20b be I ₁ , the current flowing through the input equivalent resistance R ₁ of the BAT3 terminal is I ₂ , and the current flowing through the current-limiting equivalent resistance R of the BAT3 terminal The current of ₂ is I ₃ , the current actual voltage of the single cell 30c is U ₂ , the current actual voltage of the single cell 30b is U ₁ , and the sampling chip 40 samples the sampling points Cell ₃ and Cell ₄ to obtain a fourth sampling voltage of U _d4 , the following four formulas can be constructed based on the mesh current analysis method:

I ₁ =I ₂ +I ₃ --i;

I ₃ =U _d4 /R _d --ii;

-U ₁ =I ₁ *(R _b +R ₁ )+I ₂ *R ₁ --iii;

-U ₂ =I ₂ *R ₁ +I ₃ *(R ₁ +2R ₂ +R _d )--iv;

From the above formulas i to iv, it can be solved that the current actual voltage of the single battery 30c is U ₂ as shown in the formula v:

U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d --v;

Since the parameters U _d4 , U ₁ , R ₁ , R ₂ , R _b , and R _d in the above formula v all have known parameter values, the current actual voltage U ₂ of the single battery 30c can be determined according to the formula v, that is, is the sampled voltage of the single battery 30c after compensation.

Please refer to FIG. 8 , which is a schematic structural diagram of an electronic device 200 according to an embodiment of the present application.

The electronic device 200 includes, but is not limited to, at least one processor 300 and a battery system 100, and the above components may be connected through a bus, or may be directly connected.

In an embodiment of the present application, the at least one processor 300 is, for example, a system (System On Chip) chip, a central processing unit (Central Processing Unit, CPU), an ARM (Advanced RISCMachine) processor, a field programmable gate array (Field Programmable Gate Array) Programmable GateArray, FPGA), special-purpose processors and other devices with computing processing capabilities. The sampling method is implemented when the processor 300 executes a computer program 400 stored in a memory included in the electronic device 200 . Alternatively, the memory of the electronic device 200 stores a computer instruction, and when the processor 300 of the electronic device 200 executes the computer instruction, the electronic device 200 or the processor 300 executes the sampling method.

It should be noted that FIG. 1 only illustrates the electronic device 200 by way of example. In other embodiments, the electronic device 200 may also include more elements, or have different element configurations. The electronic device 200 may be an electric motorcycle, an electric bicycle, an electric power tool, an electric vehicle, a drone, a mobile phone, a tablet computer, a personal digital assistant, a personal computer, or any other suitable rechargeable device.

In an embodiment of the present application, the computer program 400 may be divided into one or more modules (not shown in the figure), and the one or more modules may be stored in the processor 300 and executed by the processor 300 executes the sampling method of the embodiment of the present application. The one or more modules may be a series of computer program instruction segments capable of accomplishing specific functions, and the instruction segments are used to describe the execution process of the computer program 400 in the electronic device 200 .

If the modules in the computer program 400 are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the present application can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the When the computer program is executed by the processor, the steps of the above method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media Electric carrier signals and telecommunication signals are not included.

In an embodiment of the present application, the electronic device 200 may further include a memory 500 , and the one or more modules may also be stored in the memory 500 and executed by the processor 300 . The memory 500 may be an internal memory of the electronic device 200 , that is, a memory built in the electronic device 200 . In other embodiments, the memory 500 may also be an external memory of the electronic device 200 , that is, a memory externally connected to the electronic device 200 .

In an embodiment of the present application, the memory 500 is used to store program codes and various data, for example, to store the program codes of the computer program 400 installed in the electronic device 200 and implemented during the operation of the electronic device 200 Access to programs or data is done automatically.

The memory 500 may include random access memory, and may also include non-volatile memory, such as hard disk, internal memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card , a flash card (Flash Card), at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present application, rather than being used to limit the present application, as long as the above embodiments are appropriate within the scope of the essential spirit of the present application Variations and variations are within the scope of the claims of this application.

Claims (18)

1. A battery system, characterized in that the battery system comprises a plurality of single cells, a plurality of sampling units, a plurality of equalization units, a sampling chip and a processing module, and a plurality of the single cells form an electrical connection path, A plurality of the sampling units and the sampling chip form a plurality of sampling loops, each of the single cells is electrically connected to one of the sampling loops and one of the equalization units, and the first one of the plurality of single cells is electrically connected to one of the sampling loops and one of the equalization units. A single battery is correspondingly electrically connected to a first sampling unit of the plurality of sampling units and a first equalization unit of the plurality of equalization units, and the first sampling unit and the sampling chip form a first sampling loop; The processing module is used to obtain the measured voltage of the first single cell, and the sampling chip is used to measure the voltage before the first equalization unit is triggered and the first sampling loop is triggered. The first single cell performs voltage sampling to obtain a first sampling voltage, and the processing module is further configured to determine the sampling according to the first sampling voltage, the measurement voltage and the equivalent resistance of the first sampling unit The equivalent resistance of the chip, wherein the measurement voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single cell; The sampling chip is further configured to sample the voltage of the first single cell to obtain a second sampling voltage when the first equalizing unit is triggered and the first single cell enters the balanced state, and the processing module It is also used to determine the value of the first unit cell according to the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, and the equivalent resistance of the first equalizing unit. Current actual voltage. 2 . The battery system according to claim 1 , wherein the equivalent resistance of the first sampling unit comprises the input equivalent resistance and the current limiting equivalent resistance of the positive terminal branch, and the input equivalent resistance of the negative terminal branch. 3 . Equivalent resistance and current-limiting equivalent resistance, the equivalent resistance of the sampling chip is determined by the following formula: R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref −U _d1 ); Wherein, R _d is the equivalent resistance of the sampling chip, U _ref is the measured voltage of the first single cell, U _d1 is the first sampling voltage, R ₁ is the input equivalent resistance, and R ₂ is the current limiting equivalent resistance. 3. The battery system according to claim 2, wherein the current actual voltage of the first single battery is determined by the following formula: U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ]; Wherein, U ₁ is the current actual voltage of the first single battery, U _d2 is the second sampling voltage, and R _b is the equivalent resistance of the first equalizing unit. 4 . The battery system according to claim 3 , wherein the sampling chip further samples the voltage of the last single cell adjacent to the first single cell to obtain a third sampling voltage, and the processing The module is further configured to measure the third sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit and the first single battery The current actual voltage of the first unit cell determines the current actual voltage of the previous unit cell adjacent to the first unit cell. 5. The battery system according to claim 4, wherein the current actual voltage of the previous single cell adjacent to the first single cell is determined by the following formula: U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d ; Wherein, U ₀ is the current actual voltage of the last single cell adjacent to the first single cell, and U _d3 is the third sampling voltage. 6 . The battery system according to claim 3 , wherein the sampling chip further samples the voltage of the next single cell adjacent to the first single cell to obtain a fourth sampling voltage, and the processing The module is further configured to measure the fourth sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, the equivalent resistance of the first equalizing unit and the first single battery The current actual voltage of determines the current actual voltage of the next cell adjacent to the first cell. 7. The battery system of claim 6, wherein the current actual voltage of the next single cell adjacent to the first single cell is determined by the following formula: U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d ; Wherein, U ₂ is the current actual voltage of the next single cell adjacent to the first single cell, and U _d4 is the fourth sampling voltage. 8. A sampling method for a battery system, the battery system comprising a plurality of single cells, a plurality of sampling units, a plurality of equalization units and a sampling chip, a plurality of the single cells form an electrical connection path, and a plurality of the single cells form an electrical connection path. The sampling unit and the sampling chip form a plurality of sampling loops, each of the single cells is electrically connected to one of the sampling loops and one of the equalization units, and the first single cell of the plurality of single cells is electrically connected Correspondingly, the first sampling unit in the plurality of sampling units and the first equalization unit in the plurality of equalization units are electrically connected, and the first sampling unit and the sampling chip form a first sampling loop, characterized in that: The method includes: acquiring the measured voltage of the first single battery, wherein the measured voltage is a voltage obtained by directly measuring the positive electrode and the negative electrode of the first single battery; When the first equalization unit is triggered and the first sampling loop is triggered, sampling the voltage of the first single cell to obtain a first sampling voltage; determining the equivalent resistance of the sampling chip based on the first sampling voltage and the measurement voltage; Turning on the equalization unit corresponding to at least two single cells at every interval, and sampling the voltage of the first single cell in an equalized state to obtain a second sampling voltage; and The current actual voltage of the first unit cell is determined based on the second sampling voltage and the equivalent resistance of the sampling chip. 9 . The sampling method according to claim 8 , wherein the step of determining the equivalent resistance of the sampling chip based on the first sampling voltage and the measurement voltage comprises: 10 . The equivalent resistance of the sampling chip is determined based on the first sampling voltage, the measurement voltage and the equivalent resistance of the first sampling unit. 10. The sampling method according to claim 9, wherein the equivalent resistance of the first sampling unit comprises the input equivalent resistance and the current limiting equivalent resistance of the positive terminal branch, and the input of the negative terminal branch Equivalent resistance and current-limiting equivalent resistance, the step of determining the equivalent resistance of the sampling chip includes: Determine the equivalent resistance of the sampling chip by using a first preset formula; The first preset formula is: R _d =U _d1 *(2R ₁ +2R ₂ )/(U _ref -U _d1 ), R _d is the equivalent resistance of the sampling chip, and U _ref is the The measured voltage of the first unit cell, U _d1 is the first sampling voltage, R ₁ is the input equivalent resistance, and R ₂ is the current limiting equivalent resistance. 11. The sampling method according to claim 10, wherein the step of determining the current actual voltage of the first single cell based on the second sampling voltage and the equivalent resistance of the sampling chip comprises: The current actual voltage of the first single battery is determined based on the second sampling voltage, the equivalent resistance of the first sampling unit, the equivalent resistance of the sampling chip, and the equivalent resistance of the first equalizing unit . 12. The sampling method according to claim 11, wherein the step of determining the current actual voltage of the first single cell comprises: Determine the current actual voltage of the first single battery by using a second preset formula; Wherein, the second preset formula is: U ₁ =U _d2 /R _d *[(2R ₁ +R _b )*(2R ₂ +R _d )/R _b −2R ₁ ], U ₁ is the current actual voltage of the first single cell, U _d2 is the second sampling voltage, and R _b is the equivalent resistance of the first equalizing unit. 13. The sampling method of claim 12, wherein the method further comprises: sampling the voltage of the last single cell adjacent to the first single cell to obtain a third sampling voltage; and Based on the third sampling voltage, the equivalent resistance of the sampling chip, and the current actual voltage of the first single battery, the current actual voltage of the previous single battery adjacent to the first single battery is determined. 14. The sampling method according to claim 13, wherein the step of determining the current actual voltage of the previous single cell adjacent to the first single cell comprises: Using a third preset formula to determine the current actual voltage of the previous single cell adjacent to the first single cell; Wherein, the third preset formula is: U ₀ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d3 /R _d , U ₀ is the current actual voltage of the previous single cell adjacent to the first single cell, and U _d3 is the third sampling voltage. 15. The sampling method of claim 12, wherein the method further comprises: sampling the voltage of the next single cell adjacent to the first single cell to obtain a fourth sampled voltage; and The current actual voltage of the next single battery adjacent to the first single battery is determined based on the fourth sampling voltage, the equivalent resistance of the sampling chip, and the current actual voltage of the first single battery. 16. The sampling method according to claim 15, wherein the step of determining the current actual voltage of the next cell adjacent to the first cell comprises: Using a fourth preset formula to determine the current actual voltage of the next single cell adjacent to the first single cell; Wherein, the fourth preset formula is: U ₂ =-R ₁ *U ₁ /(R _b +2R ₁ )-[(R ₁ +2R ₂ +R _d )+(R _b +R ₁ )*R ₁ /(R _b +2R ₁ )]* U _d4 /R _d , U ₂ is the current actual voltage of the next cell adjacent to the first cell, and U _d4 is the fourth sampled voltage. 17. An electronic device, wherein the electronic device comprises: A battery system, including a plurality of sampling units, a plurality of equalization units, a plurality of single cells and a sampling chip; and The processor is configured to execute the steps of the sampling method of the battery system according to any one of claims 8 to 16 . 18. A readable storage medium storing computer instructions, characterized in that, when the computer instructions are executed on an electronic device, the electronic device is made to execute any one of claims 8 to 16. One of the steps of the sampling method of the battery system.

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